TY - JOUR
T1 - Nanometallurgy in aprotic media using the organometallic precursors (AlCp)4 and ZnCp2
T2 - 231th ACS National Meeting
AU - Cokoja, Mirza
AU - Schroeter, Marie Katrin
AU - Hikov, Todor
AU - Parala, Harish
AU - Van Den Berg, Maurits W.E.
AU - Gruenert, Wolfgang
AU - Fischer, Roland A.
PY - 2006
Y1 - 2006
N2 - Based on the clean decomposition of low valent group 13 organyls Ecp* (E = Al, Ga, In) under 3 bar H2 pressure in organic solvents to E(0) and Cp*H, a general route to M/E inter-metallic phases by co-decomposing suitable organometallic precursors was developed. Hence, co-hydrogenolysis of [CpCu(PMe3)] in mesitylene at 150°C with 2 eq [AlCp*] and 1 eq [ZnCp*2], respectively, quantitatively led to CuAl2 and CuZn alloys. The CuAl materials were characterized by the 27Al Knight shift resonance. Soluble and redispersable Cu/Al and Cu/Zn colloids of 10 (± 5) nm of length were obtained by addition of poly(2,6-dimethyl)(1,4-phenylene) oxide during hydrogenolysis of the precursors. Upon air oxidation, a selective oxidation of Al and Zn, respectively, forming core-shell structured particles was observed by UV-visible, EXAFS and XPS. The Al- and Zn-content can be freely adjusted, e.g., lowered down to 15% (Al) and 20 (Zn) atom %, without oxidizing the Cu(0) core. Both systems serve as quasi homogeneous, colloidal models of the heterogeneous Cu/ZnO/Al2O3 catalysts for industrial methanol synthesis. Preliminary data on the catalytic properties are presented. This is an abstract of a paper presented at the 231st ACS National Meeting (Atlanta, GA 3/26-30/2006).
AB - Based on the clean decomposition of low valent group 13 organyls Ecp* (E = Al, Ga, In) under 3 bar H2 pressure in organic solvents to E(0) and Cp*H, a general route to M/E inter-metallic phases by co-decomposing suitable organometallic precursors was developed. Hence, co-hydrogenolysis of [CpCu(PMe3)] in mesitylene at 150°C with 2 eq [AlCp*] and 1 eq [ZnCp*2], respectively, quantitatively led to CuAl2 and CuZn alloys. The CuAl materials were characterized by the 27Al Knight shift resonance. Soluble and redispersable Cu/Al and Cu/Zn colloids of 10 (± 5) nm of length were obtained by addition of poly(2,6-dimethyl)(1,4-phenylene) oxide during hydrogenolysis of the precursors. Upon air oxidation, a selective oxidation of Al and Zn, respectively, forming core-shell structured particles was observed by UV-visible, EXAFS and XPS. The Al- and Zn-content can be freely adjusted, e.g., lowered down to 15% (Al) and 20 (Zn) atom %, without oxidizing the Cu(0) core. Both systems serve as quasi homogeneous, colloidal models of the heterogeneous Cu/ZnO/Al2O3 catalysts for industrial methanol synthesis. Preliminary data on the catalytic properties are presented. This is an abstract of a paper presented at the 231st ACS National Meeting (Atlanta, GA 3/26-30/2006).
UR - http://www.scopus.com/inward/record.url?scp=33745268887&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:33745268887
SN - 0065-7727
VL - 231
JO - ACS National Meeting Book of Abstracts
JF - ACS National Meeting Book of Abstracts
Y2 - 26 March 2006 through 30 March 2006
ER -